centered rects size and position (grids)

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="https://d3js.org/d3.v4.js"></script>
<script src="https://romsson.github.io/d3-gridding/build/d3-gridding.js"></script>
<script>

var width = 600,
    height = 400;

var gridding = d3.gridding()
  .size([width, height])
	.valueWidth(function(d) { return d["w"]/ 30; })
	.valueHeight(function(d) { return d["h"]/ 30; })
	.valueX("w")
	.valueY("h")
  .mode("coordinate");

// Distribution from https://bl.ocks.org/mbostock/4248145
var randomX = d3.randomNormal(width / 2, 100),
    randomY = d3.randomNormal(height / 2, 100),
    data = d3.range(2000).map(function() { 
      return {w: randomX(), h: randomY()}; 
    });

var griddingData = gridding(data);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

svg.selectAll(".square")
    .data(griddingData)
  .enter().append("rect")
    .style("fill", "none")
		.style("stroke", "black")
    .attr("width", function(d) { return d.width; })
    .attr("height", function(d) { return d.height; })
    .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
    
  </script>
</body>

Modified http://d3js.org/d3.v4.js to a secure url

Modified http://romsson.github.io/d3-gridding/build/d3-gridding.js to a secure url

https://d3js.org/d3.v4.js

https://romsson.github.io/d3-gridding/build/d3-gridding.js